High-standard farmland construction, pollution reduction and carbon sequestration method

Abstract

The invention belongs to the technical field of high-standard farmlands, and discloses a high-standard farmland construction, pollution reduction and carbon sequestration method. The method comprises the following steps: constructing a time boundary and a space boundary for carbon accounting for a high-standard farmland; obtaining the total carbon emission amount and the total carbon sink amount of the high-standard farmland within the limits of the time boundary and the space boundary, and calculating the difference between the total carbon emission amount and the total carbon sink amount to obtain the carbon calculation amount of the high-standard farmland; the planting discharge amount acquisition method comprises the following steps: firstly, deploying a flux box at each sampling point in a to-be-monitored planting area or a to-be-monitored breeding area; secondly, obtaining the plant emission amount of each sampling point based on a flux box method, and summing the plant emission amounts to obtain the plant emission amount; and circularly executing the steps to realize high-standard farmland construction. According to the method, high-standard farmland construction is realized through comprehensive consideration from a good ecological perspective.

Description

Technical Field

[0001] The present invention relates to the technical field of high-standard farmland, and in particular to a method for high-standard farmland construction and pollution reduction and carbon fixation. Background Art

[0002] High-standard farmland refers to arable land designated as permanent basic farmland. Combined with modern agricultural production technology, it has the advantages of ensuring high and stable yields in drought and flood.

[0003] The construction of high-standard farmland in the existing technology is mainly carried out from the following aspects: improving soil, such as improving land flatness, adding quicklime, sodium phosphate and other improvers to the soil to improve soil fertility, so as to improve food safety. Improving supporting irrigation systems, such as realizing an integrated irrigation system for sewage treatment, rainwater collection, black water digestion and automatic irrigation, so as to improve irrigation capacity in water-scarce areas. Improving agricultural machinery facilities, such as designing irrigation machines that can control the amount of water during irrigation, and soil improvement and repair devices that can realize deep plowing, uniform fertilization and leveling and ditching integrated operations.

[0004] However, in the existing high-standard farmland construction process, most people consider increasing agricultural output or food planting safety, but ignore the requirement of "good ecology" in the construction of high-standard farmland, which leads to certain technical bottlenecks in the realization of high-standard farmland construction. Summary of the invention

[0005] The purpose of the present invention is to provide a method for high-standard farmland construction and pollution reduction and carbon fixation, so as to solve the technical problem of ignoring ecological construction requirements in the existing high-standard farmland construction process.

[0006] To achieve the above object, the present invention proposes the following technical solutions: In the first aspect, this technical solution provides a method for high-standard farmland construction and pollution reduction and carbon fixation, including: Constructing time boundaries and space boundaries for carbon accounting for high-standard farmland; wherein the space boundaries include: land preparation area, planting area, breeding area, irrigation and drainage area and buffer area; the time boundary is a preset time period starting from the planting start time point; wherein the planting area includes rice, and the breeding area includes aquatic plants and shellfish; Obtain the total carbon emissions and carbon sinks of high-standard farmland within the time and space boundaries, and calculate the difference between the two to obtain the carbon calculation amount of high-standard farmland; The total carbon emissions are the sum of various carbon emissions, including agricultural machinery emissions, disturbance emissions, planting emissions and electricity emissions; The steps for obtaining the agricultural machinery emissions are: first, obtaining the power, working time and fuel consumption rate of the agricultural machinery equipment to calculate the actual consumption; second, obtaining the carbon emission factor of the fuel in the agricultural machinery equipment; then, obtaining the agricultural machinery emissions based on the actual consumption and the carbon emission factor; The steps for obtaining the disturbance emission are: first, obtaining the organic carbon content, soil texture parameters and moisture parameters in the soil before land leveling; second, inputting each parameter into the DNDC model to estimate the disturbance emission; The steps for obtaining the planting emission are as follows: first, a flux box is deployed at each sampling point in the planting area or breeding area to be monitored; second, the emission of the seedlings at each sampling point is obtained based on the flux box method, and the emission of each seedling is summed to obtain the planting emission; The steps for obtaining the electricity consumption emissions are as follows: first, obtaining the power generation of non-clean energy and the average carbon dioxide emission factor of the power supply in the region; second, obtaining the electricity consumption emissions based on the power generation and the average carbon dioxide emission factor of the power supply; The carbon sink amount is the sum of various carbon sink amounts, including: carbon sequestration by shellfish aquaculture, carbon sequestration by aquatic plants, and carbon sequestration by soil; The carbon fixation amount of shellfish aquaculture is: ;in, ρ i is the culture density of the i-th shellfish, v i is the growth rate of the i-th shellfish, c i is the individual carbon content of the i-th shellfish, t i is the culture cycle of the i-th shellfish, s i is the culture area of ​​the i-th shellfish; ,in, , ;in, cb i is the carbon content of the individual shells of the i-th shellfish, cz i is the carbon content of the individual soft tissue of the i-th shellfish, p i is the individual wet weight of the i-th type of shellfish, k i The conversion coefficient between the individual wet weight and the individual dry weight of the i-th species of shellfish, r i is the percentage of shell dry mass of the i-th shellfish under dry weight, cf i is the carbon content of the dry mass of the shell of the i-th shellfish, is the percentage of dry mass of soft tissue of the i-th shellfish under dry weight, is the carbon content in the dry mass of soft tissue of the i-th shellfish; The carbon fixation amount of the aquatic plants is: ;in, W pij is the wet weight of the j-th aquatic plant harvested at the ith time, R pj is the solid content of the jth aquatic plant, R cpj is the carbon content of the jth aquatic plant based on dry weight, and Mc02 / Mc is the conversion coefficient between carbon dioxide and carbon; The soil carbon sequestration amount is: ; Among them, under the accounting time boundary limit, SOC T is the soil organic carbon content at the end time point, SOC0 is the soil organic carbon content at the start time point, Mco2 / Mc is the conversion coefficient between carbon dioxide and carbon, and T is the accounting period; the soil organic carbon content at any time point i within the accounting time boundary is: ; Among them, γ i is the soil capacity at time point i, H is the depth of the soil tillage layer, A is the area within the spatial boundary, OM i is the organic matter content of the topsoil at time point i, a1 is the conversion coefficient between soil organic carbon and soil organic matter, and a2 is the unit conversion coefficient; Taking the preset target carbon calculation amount as a reference, the rice planting area in the planting area of ​​the high-standard farmland, the shellfish farming species, shellfish farming density, shellfish farming area, aquatic plant species, aquatic plant density, and aquatic plant area in the breeding area are adjusted to adjust the carbon fixation amount, and the circulation process between rice, shellfish and aquatic plants is optimized; The above steps are repeated to continuously build high-standard farmland and reduce pollution and fix carbon.

[0007] Further, including: Adopting mid-term baking or intermittent irrigation strategies for the planting areas during the current planting cycle; Among them, the mid-term field baking includes: first, flooding after transplanting; second, baking at the end of tillering; then, maintaining the flooding state after rehydration until a preset period before harvest; the intermittent irrigation includes: first, flooding after transplanting; second, baking at the end of tillering; then, using a dry-wet alternating irrigation method after rehydration until a preset period before harvest; When the amount of seed emission in any planting area is greater than a preset seed emission threshold, the corresponding planting area is judged to be in an anaerobic environment; During the next planting cycle, the duration of each step in the mid-term field baking strategy or intermittent irrigation strategy in the corresponding planting area is adjusted.

[0008] Further, including: Obtain crop straw, aquatic plant branches and trunks, and a number of regulating components; wherein the regulating components include: nitrogen-containing substances, pH regulating substances, phosphorus-containing substances and aeration improving substances; The straw, the aquatic plant branches, and the plurality of regulating components are mixed according to a preset ratio to obtain a biomass fertilizer; wherein the straw and the aquatic plant branches account for 50% to 80%, and the plurality of regulating components account for 20% to 50%; The biomass fertilizer is used as target fertilizer for the planting area.

[0009] Furthermore, before constructing the time boundary and space boundary of the high-standard farmland for carbon accounting, the following steps are included: At the initial stage of high-standard farmland construction, the total initial carbon emissions of all construction projects are calculated, and biomass carbon is added to the soil to neutralize the total initial carbon emissions; Among them, construction projects include land leveling, canal construction, ecological ditch construction, and ecological pond construction.

[0010] Furthermore, the emission substances corresponding to the agricultural machinery emissions, the disturbance emissions, and the electricity emissions are carbon dioxide, and the emission substances corresponding to the planting emissions are methane and nitrous oxide.

[0011] Further, including: Construct a three-dimensional geographic model that is consistent with the actual regional distribution within the spatial boundary; Obtain carbon emissions and carbon sinks in each actual area and display them in real time in the corresponding model area in the three-dimensional geographic model; When it is determined that any carbon emission is greater than a preset carbon emission threshold, the corresponding model area is displayed differently.

[0012] In the second aspect, this technical solution provides a system for high-standard farmland construction and pollution reduction and carbon fixation, including: The boundary construction module is used to construct the time boundary and space boundary for carbon accounting of high-standard farmland; wherein the space boundary includes: land preparation area, planting area, breeding area, irrigation and drainage area and buffer area; the time boundary takes the planting start time as the preset time period; wherein the planting area includes rice, and the breeding area includes aquatic plants and shellfish; A data acquisition module is used to obtain the total carbon emissions and carbon sinks of high-standard farmland within the time boundary and space boundary, and calculate the difference between the two to obtain the carbon calculation amount of the high-standard farmland; The total carbon emissions are the sum of various carbon emissions, including agricultural machinery emissions, disturbance emissions, planting emissions and electricity emissions; The steps for obtaining the agricultural machinery emissions are: first, obtaining the power, working time and fuel consumption rate of the agricultural machinery equipment to calculate the actual consumption; second, obtaining the carbon emission factor of the fuel in the agricultural machinery equipment; then, obtaining the agricultural machinery emissions based on the actual consumption and the carbon emission factor; The steps for obtaining the disturbance emission are: first, obtaining the organic carbon content, soil texture parameters and moisture parameters in the soil before land leveling; second, inputting each parameter into the DNDC model to estimate the disturbance emission; The steps for obtaining the planting emission are as follows: first, a flux box is deployed at each sampling point in the planting area or breeding area to be monitored; second, the emission of the seedlings at each sampling point is obtained based on the flux box method, and the emission of each seedling is summed to obtain the planting emission; The steps for obtaining the electricity consumption emissions are as follows: first, obtaining the power generation of non-clean energy and the average carbon dioxide emission factor of the power supply in the region; second, obtaining the electricity consumption emissions based on the power generation and the average carbon dioxide emission factor of the power supply; The carbon sink amount is the sum of various carbon sink amounts, including: carbon sequestration by shellfish aquaculture, carbon sequestration by aquatic plants, and carbon sequestration by soil; The carbon fixation amount of shellfish aquaculture is: ;in, ρ i is the culture density of the i-th shellfish, v i is the growth rate of the i-th shellfish, c i is the individual carbon content of the i-th shellfish, t i is the culture cycle of the i-th shellfish, s i is the culture area of ​​the i-th shellfish; ,in, , ;in, cb i is the carbon content of the individual shells of the i-th shellfish, cz i is the carbon content of the individual soft tissue of the i-th shellfish, p i is the individual wet weight of the i-th type of shellfish, k i The conversion coefficient between the individual wet weight and the individual dry weight of the i-th species of shellfish, r iis the percentage of shell dry mass of the i-th shellfish under dry weight, cf i is the carbon content of the dry mass of the shell of the i-th shellfish, is the percentage of dry mass of soft tissue of the i-th shellfish under dry weight, is the carbon content in the dry mass of soft tissue of the i-th shellfish; The carbon fixation amount of the aquatic plants is: ;in, W pij is the wet weight of the j-th aquatic plant harvested at the ith time, R pj is the solid content of the jth aquatic plant, R cpj is the carbon content of the jth aquatic plant based on dry weight, and Mc02 / Mc is the conversion coefficient between carbon dioxide and carbon; The soil carbon sequestration amount is: ; Among them, under the accounting time boundary limit, SOC T is the soil organic carbon content at the end time point, SOC0 is the soil organic carbon content at the start time point, Mco2 / Mc is the conversion coefficient between carbon dioxide and carbon, and T is the accounting period; the soil organic carbon content at any time point i within the accounting time boundary is: ; Among them, γ i is the soil capacity at time point i, H is the depth of the soil tillage layer, A is the area within the spatial boundary, OM i is the organic matter content of the topsoil at time point i, a1 is the conversion coefficient between soil organic carbon and soil organic matter, and a2 is the unit conversion coefficient; An optimization and adjustment module, for adjusting the rice planting area in the planting area of ​​the high-standard farmland, the shellfish farming species, shellfish farming density, shellfish farming area, aquatic plant species, aquatic plant density, and aquatic plant area in the breeding area with a preset target carbon calculation amount as a reference to adjust the carbon fixation amount, and optimize the circulation process between rice, shellfish and aquatic plants; The loop execution module is used to loop the above steps to continuously build high-standard farmland and reduce pollution and fix carbon.

[0013] Further, including: A model building module is used to build a three-dimensional geographic model that is consistent with the actual distribution of regions within the spatial boundary; The data display module is used to obtain the carbon emissions and carbon sinks in each actual area and display them in real time in the corresponding model area in the three-dimensional geographic model; When it is determined that any carbon emission is greater than a preset carbon emission threshold, the corresponding model area is displayed differently.

[0014] Beneficial effects: It can be seen from the above technical solutions that the technical solution of the present invention provides a method for high-standard farmland construction and pollution reduction and carbon fixation to improve the technical defects of ignoring ecological construction in the existing high-standard farmland construction process.

[0015] First, this technical solution clarifies the spatial and temporal boundaries of the accounting, so as to accurately quantify the carbon sources and carbon sinks within the range, and provide a basic framework for the comprehensive realization of carbon monitoring. Secondly, various types of carbon emissions and carbon reserves generated during the entire life cycle of the project are considered to improve the accuracy of carbon calculation. Specifically, when calculating the total amount of carbon emissions, from the perspective of the time boundary, it is considered that operations such as excavation during land leveling disturb the soil, thereby accelerating the decomposition of organic carbon in it and releasing carbon dioxide; and then the corresponding disturbance emissions are introduced. At the same time, considering the greenhouse gas emissions caused by the use of various mechanical equipment and changes in the planting environment during land leveling, crop planting, fertilization and harvesting, and the carbon emissions caused by the use of electricity in facilities, the corresponding agricultural machinery emissions, planting emissions and electricity emissions are introduced; thereby improving the rationality and completeness of the total amount of carbon emissions obtained. When calculating the total amount of carbon sinks, from the perspective of the spatial boundary, the carbon fixation of shellfish farming, aquatic plants and soil are introduced at the same time, and the corresponding carbon fixation calculation method is designed. At this time, the carbon fixation amount can be adjusted by adjusting the rice planting area in the planting area of ​​the high-standard farmland, the shellfish farming species, shellfish farming density, shellfish farming area, aquatic plant species, aquatic plant density, and aquatic plant area in the breeding area, and optimizing the circulation process between rice, shellfish and aquatic plants; thereby realizing the ecological optimization construction of high-standard farmland. Specifically, since the planting area includes rice and the breeding area includes shellfish and aquatic plants, from the perspective of carbon fixation, during the operation of farmland, shellfish, aquatic plants and soil improvements corresponding to various carbon fixation amounts will work synergistically to effectively increase the carbon sink amount. From the perspective of pollution reduction, on the one hand, during the operation of farmland, aquatic plants can absorb the discharged nitrogen, phosphorus and other nutrient elements, and shellfish have filter feeding properties. By filtering phytoplankton and organic debris in the water, the suspended matter and nutrient salt content in the water can be effectively reduced; thereby filtering the excessive nutrients brought by agricultural non-point source pollution, playing a role in purifying water quality; thereby realizing process absorption and governance. On the other hand, non-point source pollution of rice is a source of nutrition for shells and aquatic plants. Biomass fertilizers made from grown shells and aquatic plants can also be used for rice growth. At the same time, shellfish shells can be ground into powder and used in the soil to increase the organic matter content, thereby achieving the recycling of resources.

[0016] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0017] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which: Figure 1 This is a flow chart of the method for high-standard farmland construction and pollution reduction and carbon fixation described in this embodiment; Figure 2 Flow chart for obtaining agricultural machinery emissions; Figure 3 Flow chart for disturbance emission acquisition; Figure 4 Flowchart for obtaining emissions from planting; Figure 5 Flow chart for obtaining electricity emissions; Figure 6 A flowchart for displaying calculation results; Figure 7 Flow chart for obtaining biomass fertilizer; Figure 8 Flowchart for optimization of irrigation strategy; Fig. 9 This is a structural block diagram of the system for high-standard farmland construction and pollution reduction and carbon fixation described in this embodiment. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meaning understood by people with general skills in the field to which the present invention belongs.

[0020] The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular form of "a", "an" or "the" and other similar words do not indicate a quantitative limitation, but rather indicate the presence of at least one. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before "include" or "comprise" cover the features, wholes, steps, operations, elements and / or components listed after "include" or "comprise", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] High-standard farmland refers to cultivated land that has been designated as permanent basic farmland. However, in the existing high-standard farmland construction process, most people consider increasing agricultural output or food planting safety, but ignore the requirement of "good ecology" in high-standard farmland construction, which leads to certain technical bottlenecks in realizing high-standard farmland construction. Based on this, this embodiment aims to provide a method for high-standard farmland construction and pollution reduction and carbon fixation to solve the above technical defects.

[0022] The following is a detailed introduction to the high-standard farmland construction and pollution reduction and carbon fixation methods described in this embodiment with reference to the accompanying drawings.

[0023] like Figure 1 As shown, the method includes: Step S102: constructing time boundaries and space boundaries for carbon accounting for high-standard farmland.

[0024] In this step, the spatial boundary includes: land consolidation area, planting area, breeding area, irrigation and drainage area and buffer area. Specifically, the planting area includes rice (in the construction of high-standard farmland, only rice is considered as a crop), and the breeding area includes aquatic plants and shellfish. The time boundary is a preset time period with the start time of planting as the starting point, which is one year in this embodiment. At this time, the spatial boundary and time boundary used for accounting will cover the entire high-standard farmland construction area and its associated agricultural production activities, which will help to accurately quantify the carbon sources and carbon sinks within the range, and provide a basic framework for comprehensively evaluating the pollution reduction and carbon fixation effects.

[0025] In the specific implementation, it is taken into account that in the initial stage of the construction of the transformation of ordinary farmland into high-standard farmland, the main focus is on the implementation of related construction projects. Therefore, in the initial stage of the construction of high-standard farmland, the total initial carbon emissions of all construction projects are calculated, and biomass carbon is added to the soil to neutralize the total initial carbon emissions (i.e., to offset the carbon dioxide emitted during the construction of high-standard farmland). Furthermore, if the carbon emissions during the construction process are greater than the amount of carbon fixed by the biochar put into use, the carbon sinks generated by the later high-standard farmland are used to offset the carbon emissions generated by the construction, thereby achieving carbon elimination throughout the life cycle. In the specific implementation, the construction projects include land leveling, canal construction, ecological ditch construction, and ecological pond construction.

[0026] Step S104: Obtain the total carbon emissions and carbon sinks of the high-standard farmland within the time boundary and space boundary, and calculate the difference between the two to obtain the calculated carbon amount of the high-standard farmland.

[0027] Specifically, if the calculated carbon amount is a positive value, it is a carbon sink; if the calculated carbon amount is a negative value, it is a carbon source.

[0028] In order to consider the carbon emissions and carbon storage generated throughout the entire life cycle of the project and improve the accuracy of carbon calculation, the following sub-quantities are introduced when calculating the total carbon emissions and carbon sink: The total carbon emissions are set to be the sum of various carbon emissions, including: agricultural machinery emissions, disturbance emissions, planting emissions and electricity emissions. Among them, the emission substance corresponding to the agricultural machinery emissions, the disturbance emissions, and the electricity emissions is carbon dioxide. In the process of calculating planting emissions, since the growth cycle of rice is short and the carbon dioxide absorbed after harvesting will quickly enter the carbon circle; therefore, it is judged that the carbon dioxide produced by rice will not be calculated. The planting emissions mentioned here refer to greenhouse gases in anaerobic environments. Specifically, the corresponding emissions are methane and nitrous oxide.

[0029] Specifically, considering that the various types of mechanical equipment (such as bulldozers, graders, harvesters, plant protection machines, sprayers, etc.) used in the process of land leveling, ecological ditch construction, crop fertilization and harvesting during the construction of high-standard farmland will generate carbon emissions. Figure 2 As shown, the agricultural machinery emissions are set to be obtained through the following steps: Step S10402: Obtain the power, working time and fuel consumption rate of the agricultural machinery to calculate the actual consumption.

[0030] Step S10404: Obtain the carbon emission factor of the fuel in the agricultural machinery equipment.

[0031] Step S10406: Calculate the product of the actual consumption and the carbon emission factor to obtain the agricultural machinery emissions.

[0032] Considering that excavation and other operations during land leveling will disturb the soil, accelerating the decomposition of organic carbon in the soil and releasing carbon dioxide. Figure 3 As shown, the disturbance emission is set to be obtained by the following steps: Step S10422: Obtain the organic carbon content, soil texture parameters and moisture parameters in the soil before land leveling.

[0033] Step S10424: input each parameter into the DNDC model to estimate the disturbance emission.

[0034] Considering that if anaerobic conditions occur in the planting and breeding areas, greenhouse gases such as methane and nitrous oxide will be produced. Figure 4 As shown, the planting emission is set to be obtained by the following steps: Step S10442: deploy flux boxes at each sampling point in the planting area or breeding area to be monitored.

[0035] In specific implementation, the flux box is deployed in the field and the ecological pond.

[0036] Step S10444: obtaining the planting seed emission of each sampling point based on the flux box method, and summing up the emission of each planting seed to obtain the planting emission.

[0037] Considering the electricity consumption in farmland operation, if non-clean energy is used for power generation, carbon emissions will be generated. Figure 5 As shown, the electricity consumption emission is obtained by setting the following steps: Step S10462: Obtain the power generation of non-clean energy and the average carbon dioxide emission factor of the power supply in the area.

[0038] Step S10464: Calculate the electricity consumption emissions based on the power generation and the average carbon dioxide emission factor of the power supply.

[0039] The carbon sink amount is set to be the sum of all kinds of carbon sink amounts. Considering that some aquatic plants are planted in ecological ditches and ecological ponds, they can absorb the discharged nitrogen, phosphorus and other nutrients. At the same time, shellfish are cultivated in ecological ditches and ecological ponds. Shellfish have filter feeding, such as river clams. They can effectively reduce the suspended matter and nutrient salt content in the water body by filtering phytoplankton, organic debris, etc. in the water. They can filter the excessive nutrients brought by agricultural non-point source pollution and play a role in purifying water quality. Like some eutrophic ecological ditches, the presence of shellfish can help absorb nutrients such as nitrogen and phosphorus in the water body, reduce algae breeding, and improve the transparency and dissolved oxygen status of the water body. At the same time, non-point source pollution of crops such as rice is a nutrient source for shells and aquatic plants, and biomass fertilizers made from grown shells and aquatic plants can also be used for rice growth. At the same time, the shells of shellfish are ground into powder and can be used in the soil to increase the organic matter content. Therefore, aquatic plants, rice and shellfish are set in the planting area and breeding area. Correspondingly, various types of carbon sinks include: carbon sequestration by shellfish aquaculture, carbon sequestration by aquatic plants, and carbon sequestration in soil.

[0040] Specifically, during the growth process, shellfish filter organic particles such as phytoplankton in the water and fix carbon in their shells and soft tissues. The carbon fixation amount of shellfish aquaculture is obtained as follows: ; in, ρ i is the culture density of the i-th shellfish, v i is the growth rate of the i-th shellfish, c i is the individual carbon content of the i-th shellfish, t i is the culture cycle of the i-th shellfish, s i is the culture area of ​​the i-th type of shellfish.

[0041] in: ; in, , .

[0042] in, cb i is the carbon content of the individual shells of the i-th shellfish, cz i is the carbon content of the individual soft tissue of the i-th shellfish, p i is the individual wet weight of the i-th type of shellfish, k i The conversion coefficient between the individual wet weight and the individual dry weight of the i-th species of shellfish, r iis the percentage of shell dry mass of the i-th shellfish under dry weight, cf i is the carbon content of the dry mass of the shell of the i-th shellfish, is the percentage of dry mass of soft tissue of the i-th shellfish under dry weight, is the carbon content in the dry mass of soft tissue of the i-th shellfish.

[0043] In the calculation of carbon sinks of aquatic plants, the dry weight of aquatic plants is calculated by the drying and weighing method, and then the carbon content of a certain aquatic plant harvested from the ecological pond and ecological ditch each year is calculated based on the organic carbon content of the aquatic plants. The carbon content of several aquatic plants is added together to obtain the total carbon fixation of aquatic plants in the ecological pond and ecological ditch. Specifically, the corresponding carbon fixation of the aquatic plants is: ; Where i is the batch number of the harvested aquatic plants, j is the species number of the harvested aquatic plants, W pij is the wet weight of the j-th aquatic plant harvested at the ith time, R pj is the solid content of the jth aquatic plant, R cpj is the carbon content of the jth aquatic plant based on dry weight, and Mc02 / Mc is the conversion coefficient of carbon dioxide to carbon.

[0044] In the calculation of soil carbon sinks, soil samples need to be collected regularly to determine the changes in soil organic carbon content at different depths. Specifically, the soil carbon storage model is used to calculate the soil carbon sink by comprehensively considering factors such as soil texture, soil bulk density, organic carbon input (such as crop residues, root secretions, organic fertilizer application, etc.), and organic carbon decomposition rate. For example, within a certain period of time, it was found through measurement that the organic carbon content of the soil surface layer (0-20 cm) increased from the initial value of 30% to 40%. Combined with the soil bulk density and area, the soil carbon storage calculation formula is used to obtain the soil carbon sink during this period. Specifically, the corresponding calculation formula is: ; Among them, under the accounting time boundary limit, SOC T is the soil organic carbon content at the end time point, SOC0 is the soil organic carbon content at the start time point, Mco2 / Mc is the conversion coefficient of carbon dioxide and carbon, specifically 44 / 12, and T is the accounting period.

[0045] Among them, the soil organic carbon content at any time point i within the accounting time boundary is: ; Among them, γ i is the soil capacity at time point i, H is the depth of the soil tillage layer, A is the area within the spatial boundary, OM iis the organic matter content of the topsoil at time point i, a1 is the conversion coefficient of soil organic carbon and soil organic matter, and a2 is the unit conversion coefficient.

[0046] In order to facilitate the display of carbon sink and carbon emission results and the locking of carbon exceeding areas, combined with Figure 6 As shown, the following steps are also included: Step S10482: construct a three-dimensional geographic model that is consistent with the actual regional distribution within the spatial boundary.

[0047] Step S10484, obtaining the carbon emissions and carbon sinks in each actual area and displaying them in real time in the corresponding model area in the three-dimensional geographic model; wherein, when it is determined that any carbon emission is greater than a preset carbon emission threshold, the corresponding model area is displayed differently.

[0048] In specific implementation, if carbon emissions exceed the standard, the corresponding model area can be displayed in red, and other areas can be displayed in green.

[0049] Step S106, using the preset target carbon calculation amount as a reference, adjusting the rice planting area in the planting area of ​​the high-standard farmland, the shellfish farming species, shellfish farming density, shellfish farming area, aquatic plant species, aquatic plant density, and aquatic plant area in the breeding area to adjust the carbon fixation amount and optimize the circulation process between rice, shellfish and aquatic plants.

[0050] In order to improve the accuracy of the optimization of pollution reduction and carbon fixation strategies, the strategies of high-standard farmland are optimized with reference to ordinary farmland in the early stage of high-standard farmland construction, so as to quickly find the construction entry point and realize the rapid advancement of high-standard farmland construction.

[0051] As a preferred implementation, this embodiment also specifically includes the following pollution reduction and carbon fixation strategies: Strategy 1: Combination Figure 7 As shown in the figure, using biomass fertilizer instead of compound fertilizer to reduce carbon emissions from the source includes the following steps: Step S10602: Obtain crop straw, aquatic plant branches, and several regulating components.

[0052] In specific implementation, the regulating components are used to adjust the carbon-nitrogen ratio, including: nitrogen-containing substances (such as livestock and poultry manure, urea, etc.), pH regulating substances (such as a small amount of superphosphate), phosphorus-containing substances (such as a small amount of superphosphate), and aeration improving substances (such as rice husks).

[0053] Step S10604: Mix the straw, the aquatic plant branches, and the plurality of regulating components according to a preset ratio to obtain biomass fertilizer.

[0054] In a specific implementation, the straw and the aquatic plant branches account for 50% to 80%; the several regulating components account for 20% to 50%.

[0055] Step S10606: Use the biomass fertilizer as the target fertilizer for the planting area.

[0056] Strategy 2: Grind shellfish into powder and apply it to the soil. The calcium carbonate and other ingredients in it can react with the acidic substances in the soil to increase the soil pH value, which is conducive to enhancing the activity of soil microorganisms and promoting the accumulation of soil organic carbon. At the same time, applying shellfish powder to the soil can realize the recycling of resources within the project.

[0057] Strategy 3: Since high soil moisture content will cause anaerobic conditions, the activity of methanogens will be enhanced, resulting in high CH4 emissions from rice fields. Figure 8 As shown, the goal of reducing carbon emissions can be achieved by changing irrigation methods: Step S10622: adopt an irrigation strategy of mid-term field baking or intermittent irrigation for the planting area during the current planting cycle.

[0058] In specific implementation, the mid-term field baking includes: first, flooding after transplanting; then, baking the field at the end of tillering; and secondly, maintaining the flooding state after rehydration until a preset period before harvest. Specifically, the preset period is 1 to 2 weeks.

[0059] The intermittent irrigation includes: first, flooding after transplanting; then, baking the field at the end of tillering; and second, using a dry-wet alternating irrigation method after rehydration until a preset period before harvest. Specifically, the preset period is 1 to 2 weeks.

[0060] Step S10624: When the amount of seed discharge in any planting area is greater than a preset seed discharge threshold, it is determined that the corresponding planting area is in an anaerobic environment.

[0061] Step S10626: adjust the duration of each step in the mid-term field baking strategy or intermittent irrigation strategy in the corresponding planting area in the next planting cycle.

[0062] Strategy 4: Achieve carbon reduction and carbon fixation in the design of high-standard farmland. Specifically, in the setting of farmland water channels, the farmland drainage channels are designed with a slope to facilitate the natural discharge of water, reduce the use of drainage equipment, and thus reduce carbon emissions; in the construction of ecological ditches, low-carbon materials such as carbon-fixing concrete are used as construction materials to achieve the absorption and fixation of carbon dioxide, thereby achieving the effect of carbon reduction. At the same time, according to actual conditions, fishery-photovoltaic complementary projects can be implemented on ecological ponds, and the green electricity generated can be used for the power facilities of this project, thereby reducing carbon emissions.

[0063] Step S108, execute the above steps cyclically to carry out the continuous construction of high-standard farmland and reduce pollution and fix carbon.

[0064] In summary, the method described in this embodiment has the following specific technical advantages: First, the spatial accounting boundaries and temporal accounting boundaries are clarified. At the same time, the carbon emissions and carbon storage generated throughout the entire life cycle of the project are taken into account in the project to improve the accuracy of carbon calculations. Secondly, the low-carbon concept is integrated into the design of canals and ecological ditches, and low-carbon materials are used in combination with biological measures to achieve carbon reduction; the synergistic effects of shellfish, aquatic plants and soil improvement are brought into play to enhance carbon sinks in multiple ways; water-saving irrigation is used to reduce methane emissions, and reasonable fertilization is used to reduce nitrous oxide emissions; thereby achieving multi-dimensional carbon reduction. Furthermore, the waste generated within the project is used to make biomass fertilizers, which reduces the use of compound fertilizers and reduces non-point source pollution; the characteristics of aquatic plants and shellfish are used to purify water bodies, forming a biological pollution control cycle; thereby achieving the integration of resource recycling and pollution control.

[0065] Based on the above method, this embodiment also provides a system for high-standard farmland construction and pollution reduction and carbon fixation. Fig. 9 As shown, the system includes the following functional modules: A boundary construction module is used to construct time boundaries and space boundaries for high-standard farmland for carbon accounting; wherein the space boundary includes: land preparation area, planting area, breeding area, irrigation and drainage area and buffer area; the time boundary is a preset time period with the start time of planting as the starting point; wherein the planting area includes rice, and the breeding area includes aquatic plants and shellfish.

[0066] The data acquisition module is used to obtain the total carbon emissions and carbon sinks of high-standard farmland within the time boundary and space boundary, and calculate the difference between the two to obtain the carbon calculation amount of the high-standard farmland.

[0067] Among them, the total carbon emissions are the sum of various types of carbon emissions, including: agricultural machinery emissions, disturbance emissions, planting emissions and electricity emissions.

[0068] The steps for obtaining the agricultural machinery emissions are: first, obtaining the power, working time and fuel consumption rate of the agricultural machinery equipment to calculate the actual consumption; second, obtaining the carbon emission factor of the fuel in the agricultural machinery equipment; then, obtaining the agricultural machinery emissions based on the actual consumption and the carbon emission factor.

[0069] The steps for obtaining the disturbance emission are as follows: first, obtaining the organic carbon content, soil texture parameters and moisture parameters in the soil before land leveling; second, inputting each parameter into the DNDC model to estimate the disturbance emission.

[0070] The steps for obtaining the planting emission are as follows: first, a flux box is deployed at each sampling point in the planting area or breeding area to be monitored; second, the emission of the seedlings at each sampling point is obtained based on the flux box method, and the emission of each seedling is summed to obtain the planting emission.

[0071] The steps for obtaining the electricity emissions are: first, obtaining the power generation of non-clean energy and the average carbon dioxide emission factor of the power supply in the area; second, obtaining the electricity emissions based on the power generation and the average carbon dioxide emission factor of the power supply.

[0072] Among them, the carbon sink amount is the sum of various carbon sink amounts, including: carbon sequestration in shellfish aquaculture, carbon sequestration in aquatic plants, and carbon sequestration in soil.

[0073] The carbon fixation amount of shellfish aquaculture is: ;in, ρ i is the culture density of the i-th shellfish, v i is the growth rate of the i-th shellfish, c i is the individual carbon content of the i-th shellfish, t i is the culture cycle of the i-th shellfish, s i is the culture area of ​​the i-th shellfish; ,in, , ;in, cb i is the carbon content of the individual shells of the i-th shellfish, cz i is the carbon content of the individual soft tissue of the i-th shellfish, p i is the individual wet weight of the i-th type of shellfish, k i The conversion coefficient between the individual wet weight and the individual dry weight of the i-th species of shellfish, r i is the percentage of shell dry mass of the i-th shellfish under dry weight, cf i is the carbon content of the dry mass of the shell of the i-th shellfish, is the percentage of dry mass of soft tissue of the i-th shellfish under dry weight, is the carbon content in the dry mass of soft tissue of the i-th shellfish; The carbon fixation amount of the aquatic plants is: ;in, W pij is the wet weight of the j-th aquatic plant harvested at the ith time, R pjis the solid content of the jth aquatic plant, R cpj is the carbon content of the jth aquatic plant based on dry weight, and Mc02 / Mc is the conversion coefficient between carbon dioxide and carbon; The soil carbon sequestration amount is: ; Among them, under the accounting time boundary limit, SOC T is the soil organic carbon content at the end time point, SOC0 is the soil organic carbon content at the start time point, Mco2 / Mc is the conversion coefficient between carbon dioxide and carbon, and T is the accounting period; the soil organic carbon content at any time point i within the accounting time boundary is: ; Among them, γ i is the soil capacity at time point i, H is the depth of the soil tillage layer, A is the area within the spatial boundary, OM i is the organic matter content of the topsoil at time point i, a1 is the conversion coefficient of soil organic carbon and soil organic matter, and a2 is the unit conversion coefficient.

[0074] The optimization and adjustment module is used to adjust the rice planting area in the planting area of ​​the high-standard farmland, the shellfish farming species, shellfish farming density, shellfish farming area, aquatic plant species, aquatic plant density, and aquatic plant area in the breeding area with a preset target carbon calculation amount as a reference to adjust the carbon fixation amount and optimize the circulation process between rice, shellfish and aquatic plants.

[0075] The loop execution module is used to loop the above steps to continuously build high-standard farmland and reduce pollution and fix carbon.

[0076] At the same time, in order to facilitate the locking of excess carbon and the display of calculation results, it also includes: The model building module is used to build a three-dimensional geographic model that is consistent with the actual regional distribution within the spatial boundary.

[0077] The data display module is used to obtain the carbon emissions and carbon sinks in each actual area and display them in real time in the corresponding model area in the three-dimensional geographic model. When it is determined that any carbon emission is greater than the preset carbon emission threshold, the corresponding model area is displayed differently.

[0078] Since the system is built based on the method, it can also effectively meet the ecological needs in the process of high-standard farmland construction during its specific implementation.

[0079] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A method for high-standard farmland construction and pollution reduction and carbon fixation, characterized in that: include: Constructing time boundaries and space boundaries for carbon accounting for high-standard farmland; wherein the space boundaries include: land preparation area, planting area, breeding area, irrigation and drainage area and buffer area; the time boundary is a preset time period starting from the planting start time point; wherein the planting area includes rice, and the breeding area includes aquatic plants and shellfish; Obtain the total carbon emissions and carbon sinks of high-standard farmland within the time and space boundaries, and calculate the difference between the two to obtain the carbon calculation amount of high-standard farmland; The total carbon emissions are the sum of all types of carbon emissions, including agricultural machinery emissions, disturbance emissions, planting emissions and electricity emissions; The steps for obtaining the agricultural machinery emissions are: first, obtaining the power, working time and fuel consumption rate of the agricultural machinery equipment to calculate the actual consumption; second, obtaining the carbon emission factor of the fuel in the agricultural machinery equipment; then, obtaining the agricultural machinery emissions based on the actual consumption and the carbon emission factor; The steps for obtaining the disturbance emission are: first, obtaining the organic carbon content, soil texture parameters and moisture parameters in the soil before land leveling; second, inputting each parameter into the DNDC model to estimate the disturbance emission; The steps for obtaining the planting emission are as follows: first, a flux box is deployed at each preset sampling point in the planting area or breeding area to be monitored; second, the emission of the seedlings at each sampling point is obtained based on the flux box method, and the emission of each seedling is summed to obtain the planting emission; The steps for obtaining the electricity consumption emissions are as follows: first, obtaining the power generation of non-clean energy and the average carbon dioxide emission factor of the power supply in the region; second, obtaining the electricity consumption emissions based on the power generation and the average carbon dioxide emission factor of the power supply; The carbon sink amount is the sum of various carbon sink amounts, including: carbon sequestration by shellfish aquaculture, carbon sequestration by aquatic plants, and carbon sequestration by soil; The carbon fixation amount of shellfish aquaculture is: ;in, ρ i is the culture density of the i-th shellfish, v i is the growth rate of the i-th shellfish, c i is the individual carbon content of the i-th shellfish, t i is the culture cycle of the i-th shellfish, s i is the culture area of ​​the i-th shellfish; ,in, , ;in, cb i is the carbon content of the individual shells of the i-th shellfish, cz i is the carbon content of the individual soft tissue of the i-th shellfish, p i is the individual wet weight of the i-th type of shellfish, k i The conversion coefficient between the individual wet weight and the individual dry weight of the i-th species of shellfish, r i is the percentage of dry mass of shells of the i-th shellfish under dry weight, cf i is the carbon content of the dry mass of the shell of the i-th shellfish, is the percentage of dry mass of soft tissue of the i-th shellfish under dry weight, is the carbon content in the dry mass of soft tissue of the i-th shellfish; The carbon fixation amount of the aquatic plants is: ;in, W pij is the wet weight of the j-th aquatic plant harvested at the ith time, R pj is the solid content of the jth aquatic plant, R cpj is the carbon content of the jth aquatic plant based on dry weight, and Mc02 / Mc is the conversion coefficient between carbon dioxide and carbon; The soil carbon sequestration amount is: ; Among them, under the accounting time boundary limit, SOC T is the soil organic carbon content at the end time point, SOC0 is the soil organic carbon content at the start time point, Mco2 / Mc is the conversion coefficient between carbon dioxide and carbon, and T is the accounting period; the soil organic carbon content at any time point i within the accounting time boundary is: ; Among them, γ i is the soil capacity at time point i, H is the depth of the soil tillage layer, A is the area within the spatial boundary, OM i is the organic matter content of the topsoil at time point i, a1 is the conversion coefficient between soil organic carbon and soil organic matter, and a2 is the unit conversion coefficient; Taking the preset target carbon calculation amount as a reference, the rice planting area in the planting area of ​​the high-standard farmland, the shellfish farming species, shellfish farming density, shellfish farming area, aquatic plant species, aquatic plant density, and aquatic plant area in the breeding area are adjusted to adjust the carbon fixation amount, and the circulation process between rice, shellfish and aquatic plants is optimized; The above steps are repeated to continuously build high-standard farmland and reduce pollution and fix carbon.

2. The method for high-standard farmland construction and pollution reduction and carbon fixation according to claim 1, characterized in that: include: Adopt mid-term baking or intermittent irrigation strategies for each planting area during the current planting cycle; Among them, the mid-term field baking includes: first, flooding after transplanting; second, baking at the end of tillering; then, maintaining the flooding state after rehydration until a preset period before harvest; the intermittent irrigation includes: first, flooding after transplanting; second, baking at the end of tillering; then, using a dry-wet alternating irrigation method after rehydration until a preset period before harvest; When the amount of seed emission in any planting area is greater than a preset seed emission threshold, the corresponding planting area is judged to be in an anaerobic environment; During the next planting cycle, the duration of each step in the mid-term field baking strategy or intermittent irrigation strategy in the corresponding planting area is adjusted.

3. The method for high-standard farmland construction and pollution reduction and carbon fixation according to claim 1, characterized in that: include: Obtain crop straw, aquatic plant branches and trunks, and a number of regulating components; wherein the regulating components include: nitrogen-containing substances, pH regulating substances, phosphorus-containing substances and aeration improving substances; The straw, the aquatic plant branches, and the plurality of regulating components are mixed according to a preset ratio to obtain a biomass fertilizer; wherein the straw and the aquatic plant branches account for 50% to 80%, and the plurality of regulating components account for 20% to 50%; The biomass fertilizer is used as target fertilizer for the planting area.

4. The method for high-standard farmland construction and pollution reduction and carbon fixation according to claim 1, characterized in that: Before constructing the time boundary and space boundary for carbon accounting of high-standard farmland, it includes: At the initial stage of high-standard farmland construction, the total initial carbon emissions of all construction projects are calculated, and biomass carbon is added to the soil to neutralize the total initial carbon emissions; Among them, construction projects include land leveling, canal construction, ecological ditch construction, and ecological pond construction.

5. The method for high-standard farmland construction and pollution reduction and carbon fixation according to claim 1, characterized in that: The emission substances corresponding to the agricultural machinery emissions, the disturbance emissions, and the electricity emissions are carbon dioxide, and the emission substances corresponding to the planting emissions are methane and nitrous oxide.

6. The method for high-standard farmland construction and pollution reduction and carbon fixation according to claim 1, characterized in that: include: Construct a three-dimensional geographic model that is consistent with the actual regional distribution within the spatial boundary; Obtain carbon emissions and carbon sinks in each actual area and display them in real time in the corresponding model area in the three-dimensional geographic model; When it is determined that any carbon emission is greater than a preset carbon emission threshold, the corresponding model area is displayed differently.

7. A system for high-standard farmland construction and pollution reduction and carbon fixation, characterized in that: include: The boundary construction module is used to construct the time boundary and space boundary of the high-standard farmland for carbon accounting; wherein the space boundary includes: land preparation area, planting area, breeding area, irrigation and drainage area and buffer area; the time boundary is a preset time period starting from the planting start time point; wherein the planting area includes rice, and the breeding area includes aquatic plants and shellfish; A data acquisition module is used to obtain the total carbon emissions and carbon sinks of high-standard farmland within the time boundary and space boundary, and calculate the difference between the two to obtain the carbon calculation amount of the high-standard farmland; The total carbon emissions are the sum of all types of carbon emissions, including agricultural machinery emissions, disturbance emissions, planting emissions and electricity emissions; The steps for obtaining the agricultural machinery emissions are: first, obtaining the power, working time and fuel consumption rate of the agricultural machinery equipment to calculate the actual consumption; second, obtaining the carbon emission factor of the fuel in the agricultural machinery equipment; then, obtaining the agricultural machinery emissions based on the actual consumption and the carbon emission factor; The steps for obtaining the disturbance emission are: first, obtaining the organic carbon content, soil texture parameters and moisture parameters in the soil before land leveling; second, inputting each parameter into the DNDC model to estimate the disturbance emission; The steps for obtaining the planting emission are as follows: first, a flux box is deployed at each sampling point in the planting area or breeding area to be monitored; second, the emission of the seedlings at each sampling point is obtained based on the flux box method, and the emission of each seedling is summed to obtain the planting emission; The steps for obtaining the electricity consumption emissions are as follows: first, obtaining the power generation of non-clean energy and the average carbon dioxide emission factor of the power supply in the region; second, obtaining the electricity consumption emissions based on the power generation and the average carbon dioxide emission factor of the power supply; The carbon sink amount is the sum of various carbon sink amounts, including: carbon sequestration by shellfish aquaculture, carbon sequestration by aquatic plants, and carbon sequestration by soil; The carbon fixation amount of shellfish aquaculture is: ;in, ρ i is the culture density of the i-th shellfish, v i is the growth rate of the i-th shellfish, c i is the individual carbon content of the i-th shellfish, t i is the culture cycle of the i-th shellfish, s i is the culture area of ​​the i-th shellfish; , , ;in, cb i is the carbon content of the individual shells of the i-th shellfish, cz i is the carbon content of the individual soft tissue of the i-th shellfish, p i is the individual wet weight of the i-th type of shellfish, k i The conversion coefficient between the individual wet weight and the individual dry weight of the i-th species of shellfish, r i is the percentage of dry mass of shells of the i-th shellfish under dry weight, cf i is the carbon content of the dry mass of the shell of the i-th shellfish, is the percentage of dry mass of soft tissue of the i-th shellfish under dry weight, is the carbon content in the dry mass of soft tissue of the i-th shellfish; The carbon fixation amount of the aquatic plants is: ;in, W pij is the wet weight of the j-th aquatic plant harvested at the ith time, R pj is the solid content of the jth aquatic plant, R cpj is the carbon content of the jth aquatic plant based on dry weight, and Mc02 / Mc is the conversion coefficient between carbon dioxide and carbon; The soil carbon sequestration amount is: ; Among them, under the accounting time boundary limit, SOC T is the soil organic carbon content at the end time point, SOC0 is the soil organic carbon content at the start time point, Mco2 / Mc is the conversion coefficient between carbon dioxide and carbon, and T is the accounting period; the soil organic carbon content at any time point i within the accounting time boundary is: ; Among them, γ i is the soil capacity at time point i, H is the depth of the soil tillage layer, A is the area within the spatial boundary, OM i is the organic matter content of the topsoil at time point i, a1 is the conversion coefficient between soil organic carbon and soil organic matter, and a2 is the unit conversion coefficient; An optimization and adjustment module, for adjusting the rice planting area in the planting area of ​​the high-standard farmland, the shellfish farming species, shellfish farming density, shellfish farming area, aquatic plant species, aquatic plant density, and aquatic plant area in the breeding area with a preset target carbon calculation amount as a reference to adjust the carbon fixation amount, and optimize the circulation process between rice, shellfish and aquatic plants; The loop execution module is used to loop the above steps to continuously build high-standard farmland and reduce pollution and fix carbon.

8. The system for high-standard farmland construction and pollution reduction and carbon fixation according to claim 7 is characterized in that: include: A model building module is used to build a three-dimensional geographic model that is consistent with the actual distribution of regions within the spatial boundary; The data display module is used to obtain the carbon emissions and carbon sinks in each actual area and display them in real time in the corresponding model area in the three-dimensional geographic model; When it is determined that any carbon emission is greater than a preset carbon emission threshold, the corresponding model area is displayed differently.

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